Variable Neutral Density Attenuators/Filters
Continuously Variable Attenuator
For maximum ease of use there is the continuously variable attenuator that can vary its attenuation over a very wide range
just by pushing and pulling the filters laterally. The attenuator consists of two opposite wedges of ND glass. The surfaces are
arranged so that no parallel surfaces face each other so as to eliminate interference effects.
The variable attenuator uses the same C mount thread as the other components so it can be combined with additional
stackable filters and beam splitters if necessary as shown.
Spiricon variable atenuator transmition vs. wavelength
1E +0
1E -1
Transmission
1E -2
1E -3
1E -4
1E -5
1E -6
1E -7
1E -8
350
450
550
650
• max trans
Push/Pull to
vary attenuation
Additional filter
Attenuation Sliders
Illustration of variable attenuator
mounted with additional fillter
and beam splitters
Item
Nominal OD (vis)
Aperture
Optical quality
Damage threshold
750
850
■ min rtans
151
For latest updates please visit our website: www.ophir-spiricon.com
27 July 2009
1050
Variable attenuator
1 – 6 continuously variable
Ø20mm
2 waves in visible
50W/cm2 , 1J/cm2 for ns pulses
Ordering Information
Description
Compact screw in filter holder with set of ND filters. Attenuations from low to 106
4mm spacing screw on filter for camera with transmission of between 20% and 5% depending
on spectral range Can be stacked and combined with other filters and beam splitters. One filter is
included with Spiricon cameras
4mm spacing screw on filter for camera with transmission of between 7% and 0.5% depending on
ND2 stackable filter
spectral range. Can be stacked and combined with other filters and beam splitters. Two filters are
(black housing)
included with Spiricon cameras
4mm spacing screw on filter for camera with transmission of between 2% and 0.05% depending on
ND3 stackable filter
spectral range. Can be stacked and combined with other filters and beam splitters
(green housing)
Continuously variable filter for complete control over beam intensity. Especially useful for pulsed
Variable filter
lasers. Varies the intensity over more than 4 orders of magnitude between wavelengths 350nm and
1100nm. Can be stacked and combined with other filters and beam splitters
Filter holder and 50x50 filter Filter holder with set of 4 standard Schott 50X50mm neutral density filters. Useful to reduce
intensity before inputting into 4X beam reducer. Mounts to standard ¼” thread, ½” diameter
set
laboratory rod
Filter for 355nm-V2; give an Silicon cameras can see the 355nm 3rd harmonic radiation of YAG. The YAG however usually
emits some light at 532nm and 1064nm as well. This filter filters out the other 2 wavelengths to give
undistorted image of the
undistorted image of the 355nm light
355nm light.
For all cameras that can operate at 1300nm but are quite insensitive there. This filter filters out all
Filter for 1300nm
light below 1200nm to allow viewing 1300nm radiation without background interference
4mm spacer
Blank stackable spacer / filter holder where 4mm spacing is needed but no attenuation is needed
5mm spacer
Spacer ring for adapting 12.5mm recess CS cameras to 17.5mm recess C mount lenses
8mm spacer
Spacer ring for adapting 4.5mm recess cameras to work with 12.5mm recess CS mount lenses
Item
LBF-50 filter set
ND1 stackable filter
(red housing)
950
P/N
SP90081
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SPZ08253
SPZ17012
SPZ08240
SPZ08246
SPZ08242
SPG01698
SPG02106
SPG02067